Andrews Engineering is a full service, multidisciplinary engineering organization serving areas in Illinois, Indiana, and Missouri.

Clear Creek Associates is a subsidiary of GLA providing practical solutions in groundwater science.

Daniel B. Stephens & Associates, Inc. is a subsidiary of GLA providing geologic, engineering, water, and environmental consulting.

Geo-Logic provides solutions to challenges for landfills, mines, contaminated sites, municipal projects, natural resources, and water resources.

Peruvian consulting firm focused on geology, geotechnics, hydrogeology, civil design and environmental engineering projects.

John Shomaker & Associates provides expert hydrogeology services throughout the Southwest.

Kunkel Engineering Group provides consulting, engineering, surveying, construction management, and funding procurement services exclusively to municipal clients.

Loughlin Water Associates provides expert, comprehensive water resource and geoscience solutions.

Geotechnical engineering consulting firm whose expertise results in innovative, practical, and cost-effective solutions.

Summit Water Resources offers groundwater supply and water resource management consulting in the Pacific Northwest.

The MINES Group is a subsidiary of GLA providing permitting, design, and compliance service for mine sites across the globe.